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DNSSEC and IPv6 A6 aware server/resolver message size requirements

The information below is for an old version of the document that is already published as an RFC.
Document Type
This is an older version of an Internet-Draft that was ultimately published as RFC 3226.
Author Ólafur Guðmundsson
Last updated 2020-01-21 (Latest revision 2001-02-23)
RFC stream Internet Engineering Task Force (IETF)
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IESG IESG state RFC 3226 (Proposed Standard)
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A new Request for Comments is now available in online RFC libraries.

        RFC 3226

        Title:      DNSSEC and IPv6 A6 aware server/resolver message
                    size requirements
        Author(s):  O. Gudmundsson
        Status:     Standards Track
        Date:       December 2001
        Pages:      6
        Characters: 12078
        Updates:    2874, 2535

        I-D Tag:    draft-ietf-dnsext-message-size-04.txt


This document mandates support for EDNS0 (Extension Mechanisms for
DNS) in DNS entities claiming to support either DNS Security
Extensions or A6 records.  This requirement is necessary because these
new features increase the size of DNS messages.  If EDNS0 is not
supported fall back to TCP will happen, having a detrimental impact on
query latency and DNS server load.  This document updates RFC 2535
and RFC 2874, by adding new requirements.

This document is a product of the DNS Extensions Working Group of the

This is now a Proposed Standard Protocol.

This document specifies an Internet standards track protocol for
the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the
"Internet Official Protocol Standards" (STD 1) for the
standardization state and status of this protocol.  Distribution
of this memo is unlimited.

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